You might not know that Jane Foster is more than the love interest of the man, because she wasn't in any of the movies. The first trailer shows that the movie will fix that and some.
The first trailer for Love and Thunder tries to catch you up with what Chris Hemsworth has been up to since the end of the movie. With the Mad Titan gone and peace mostly restored, Thor has been working off his depression weight, and making the best of his life as one of the last living Asgardians. It's not clear how much time THOR is going to spend with the Guardians, but some of the story is going to focus on him travelling across the universe in order to meet other.
The rest of the Asgardians who are still alive have been trying to rebuild their society in the Norweigan town, but they don't seem to have a lot of interaction withThor. It appears as if the life of bureaucratic drudgery that keeps her away from battles has been caused by the new position of New Asgard's leader. The trailer for Love and Thunder introduces an updated Jane Foster, who calls Mjolnir to her in the middle of a battle, in stark contrast to the relaxed approach taken by Val and Thor.
When last we saw this Jane variant, she was still in the midst of falling in love, Asgard was still standing, and Thanos had not yet laid waste to the entire universe. It's interesting that Love andThunder is pulling in elements of Jane's time as the only person capable of wielding Mjolnir, which is an interesting bit of lore to bring her back into the films with. One of the big mysteries looming over this new THOR is which universe she is originally from and how that might factor into her future in the MCU.
July 8th, 2022, is when the movie is slated to hit theaters.